hugo/docs/content/en/functions/collections/Intersect.md

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title	linkTitle	description	categories	keywords	menu	function	relatedFunctions	aliases
collections.Intersect	intersect	Returns the common elements of two arrays or slices, in the same order as the first array.	functions		docs parent functions	aliases returnType signatures intersect any collections.Intersect SET1 SET2	collections.Complement collections.Intersect collections.SymDiff collections.Union	/functions/intersect

A useful example is to use it as AND filters when combined with where:

AND filter in where query

{{ $pages := where .Site.RegularPages "Type" "not in" (slice "page" "about") }}
{{ $pages := $pages | union (where .Site.RegularPages "Params.pinned" true) }}
{{ $pages := $pages | intersect (where .Site.RegularPages "Params.images" "!=" nil) }}

The above fetches regular pages not of page or about type unless they are pinned. And finally, we exclude all pages with no images set in Page parameters.

See union for OR.